WhozThat? evolving an ecosystem for context-aware mobile social networks. - Aaron Beach; Mike Gartrell; Sirisha Akkala; Jack Elston; John Kelley; Keisuke Nishimoto; Baishakhi Ray; Sergei Razgulin; Karthik Sundaresan; Bonnie Surendar; Michael Terada; Richard Han 001 (IEEE Netw., 2008)